Why action and reaction do not cancel out each other ?
Newton's third law of motion The law states that ‘To every action, there is an equal and opposite reaction’. When one object exerts a force on another object, instantaneously the second…
What device converts AC to DC ?
As we know , AC current alternate its direction whereas DC current is unidirectional. An electronic device called a rectifier uses one or more P-N junction diodes to change alternating…
Why are red coloured lights are used in traffic signals to stop the vehicles?
Explanation As We know about the scattering of light in which light get scattered in different directions after striking with atmosphere particles. Light colour of longest wavelength is scattered by…
Depict the direction of induced emf in coils placed near current carrying wire in figure ?
The direction of induced emf is given by lenz law which states that direction of induced emf is such that it oppose the cause which is producing it. case a…
Is it necessary that if displacement is zero work done is also zero?? Explain w
As ,we know that relation between work and displacement is given by : Work = force × displacement. work done is defined as scalar product of force and displacement .…
What is Total Internal Reflection (TIR) and its application ?
Its is the phenomenon in which ray of light travelling at an angle of incidence greater than critical angle from denser to rarer medium is totally reflected back to same…
If the earth were to suddenly contract to half its present size, without any change in its mass, the duration of the new day be
r2=1/2 r1 m1=m2=m(say) T1=24hr By the conservation of angular momentum, I1 ω1 = I2ω2. . . . . . . . .(1) Where, ω=2π/T ,angular velocity of the earth I=2/5…
why gunman should hold the gun tight to his shoulder while firing a bullet ?
Because when a bullet is fired from a gun, the force sending the bullet forward (action) is equal to the force sending the gun backward (reaction). But the mass of…
Why does capacitor block DC and allow AC ?
1) Theoretical approach In the case of AC voltage When AC voltage is connected with a capacitor, one plate of the capacitor gets charged positively and the other gets negatively…
Is it easier to pull or push a body ?
It is easier to pull a body rather than pushing it over a rough surface when height of object is smaller than height of person. Explanation : Case 1 .…